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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdab8198fe18cc4264a0ada6976fb3b02c933038a86fc24409401bffc839679' 
  AND token = 'aQlUNiKDH6wV8oYsDM/ts5v2rez67NSewYyYElzJJAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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