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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcf82de6a88416a53c62e98f17246da0a309ce9ecab0193c5743680c579e2ab' 
  AND token = 'rExa2kfBm20XQNhkaV2T61AnA/ZFBa/TEbMUmwD+Yig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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