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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493f472b161a131d6256e45df6270284c3f91de6ef222f04f4f4a614fcb2ee6b' 
  AND token = 'qy/opUR2oEvv1/RXpyf0eSMf+6DMD08/8cwq2MCQr7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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