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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dd7cdd7d96d14b4d8ad626947ec3a48891f9918e8000feccea9927406ea736' 
  AND token = 'AgD6sO3yHx/wdqbC0lrJ5808QmXaakcx1gbO/BJn7Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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