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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12eac14d5ccefbabb0be0c1fd0e7fa3fabaa79a1598712eaf936fac307b98f07' 
  AND token = 'nd9iJKf08EafC6nsMTAK2ikandp9zrV6dw1YIN63yRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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