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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313de628e19dfba1f791a60a5d0c7a9201dd9f75acf865f0c93cf5c01df20dbd' 
  AND token = '3NlX/Q9Mml0qeNhBKWANy9Uc9e+bdrRBPRSyalhJjSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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