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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d024593c99135178cdb6070e5b000b7b8f22150fa14be5a7190685135bcc06' 
  AND token = 'uk5RY4JVaUyxAo5ASfQ40O64G3t4uQFAXyOB3eh02XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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