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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26db48e53ec1b598dee4d34c157eef423f1bd7d8b05609b2bca7dc21e722e1b' 
  AND token = 'Vf2F9Ow5ldMSaOfvedlXc2OM49NnstUqptH6TjDH8P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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