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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd97bcf6af09594c543f1c02c1e2d3f4173012694da86672a29ffd2480ee1c7' 
  AND token = 'H7Ztn4eR+ojTUglD6wA6D85CILRTeC6/PEFlT/GDTgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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