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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce679eb375c1b139acfbe81550244606e2e3898be49d550c4aa24265b0547961' 
  AND token = 'SHJ20n6QD33fFPwDo2PEuX3xHm960EP08I28X6w2xeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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