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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd88e813ef5c802d814e522416de767f43b80d57874e6897bc385333c2c0cece' 
  AND token = 'hYdgz0EqkQpv67Rq35fjxfuXUsB984qqlZ0XbmPDi08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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