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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44dcf6b3ef4cce3ad358c09a44c65b1ac3ead20d178351ee9d16bad99bbb2d3' 
  AND token = 'BHtIb3fS1IQhnByeQepmL8oALBNA4tFPsTVSLiwOmpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}