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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba26f857a4344264f3e71c28e5a93cb7fd1e64faf448ab4ff3cbfce098ec1b5' 
  AND token = 'stQ/dSFA0lP0IUT56OIPdeMGw5rQEH5qhTyKI8APCS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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