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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164868434fc3ae51a9777f15edc9fa5aaf428b9972207d224d2ba4523442544f' 
  AND token = 'UlNxkCxCb38g1w9an1r/paBlehagVJ17E1236F9U/jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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