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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167a176bb9db80b867e5157d6cdcab4e8ac39f143a822531b6a981c8f8eba6f6' 
  AND token = 'S/94kfd/PglaeqjHssi+uSL73n15RCBvvrnyQzAlUG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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