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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0edb1cd2b352d1d88706bd7093d928daaa9e6e077b62e224195f524c66546684' 
  AND token = 'eb2ONYCPMej92ZD7aKrHeNKmJ4j3+KsyUMJVGqIaNc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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