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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1062f4b9e8ce094639046423a8a87d2e87625aaf0aca016eaa40f1d50ed6a6e' 
  AND token = 'GbFfQvK3Wqo8en6bfqZSoNeL4zy9IXukn8tLIFEyT/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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