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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f777813c39704d0642aaf384d0cc21fcc211eb2971e88e69d274105ef6f3992' 
  AND token = 'L0lIuRn7+43yBYJknc0yj1Yke87T7CVTlmPiw7086s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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