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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fa3ba5bf173f775c30de419494c7c0740e669e54b7d424ccb7a312bf4a7e30' 
  AND token = '3yxD3bEy8lBxtGlbNV/S6IHrGrYIrg+z8GYywDG0C+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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