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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c326535685b42ec58b10ca8eaf94b31d8abc8c592b62f5232e509baa1400e9' 
  AND token = 'ioQmcHwe74O5gxnXBIGbeBzdDoYr40CRS/7Ke/Ttiuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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