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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ba0174f0bd59952ff2181c3264ac30e0586fe2d2024b7d1e6745ac48059a7d' 
  AND token = 'dgRaAAmPmaG1FEQd+64kXKn+vab9TB2us3m93rHkgVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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