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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8cf37b96488add3897b4e207717c16e0db707030c68d56c913fa2914d5bd6e' 
  AND token = 'hThJ5/pPS6u6SWbncN0oNWhUHXnqgzavJe7mWfiakJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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