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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968b81ff307114a3566ebadcbbcd369f03122e7cb588e73a49f66c627b2c07d9' 
  AND token = '2Tr4DxqG6AJ/zWHyrQiJux63m6qE69/Ra4MhASdFkgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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