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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c2c7e9cb6eb53501a4cfe60d5a487c8c7b8d3d23ef7b396f88aa9119ec7170' 
  AND token = 'j9UcQGRN5sJ8Atu2VGXs26wAckpwtanPJqR4816ORhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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