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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd14893eeb860488c62f89b254452ce684ed359fe6bf27caff9107263f9d4fc8' 
  AND token = 'hl2lH9cJHQSku0QD+3X0MydsG5nMErXw0UzScB9SRjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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