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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea2cee748a54f324ec2b1836223ad884ec8305db6a3e1b3811800d045770a02' 
  AND token = 'B9KicJuEn2zv5t7Uf2bVRUGUvchZv7S7bRaZf1eV2xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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