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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b0cd7a2a1e10fe0ebc42ac937bf54610bbce6cf43d214a7c339ebb66a7f2d6' 
  AND token = 'xh1zuRJXG9ZoqpT7zYP25O1YRj21OOBD5rHkHl6UJoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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