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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9b166403754c10ddb74cf063895c29c9af2bee91139fcde3d0b4ccd54085a0' 
  AND token = '0hmBoKkwGeRu8EJaxVtnsSaeuTYpbg5B+YrY3wbBFGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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