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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bced535e39271e821b34933314391b5d64faae0a68b62ab65ad2ae6f5d8e4fbe' 
  AND token = 'yLzu/ix1Iqx5slMo+DStI05C5iMVn7R2jKclF71pNXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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