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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd71c4ddc3bbff2226d46550222435c0b35b415ffbf143f83c93c758c08b52b5' 
  AND token = 'fIH+/xwJQwYYA4VwufJ6Cv3bOCUZokrn0zPx4pSySdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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