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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f5f6d8c0a4998ef3f3ad01dcad6f7db6faddc7a92f446f6e9d454d49dbf088' 
  AND token = '8PRxFMuJ5lAsVS9KnjfQWTJeOLk/j9eCXx6sVL22auM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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