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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4306cf4aad5a92d5592dbc69b104e21edfc9b18e70d63ef14dbb83145022bc7' 
  AND token = 'P76q8i7YPb5wpj2OECetmGJdzz73dmIXx/6KRwUJ4dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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