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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9141c62ffd474cb12b71cd56908f7a17475b13045de97e92764ca58d300b1436' 
  AND token = 'vSaneVfAMs2kx9/f6GNKlD6oJRx03zYfSBsChS827Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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