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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dbcffd2212aad9e8670e274ddc89b76057d604c8dcf0a43f234ea47f769e5a' 
  AND token = '7PANwymiEg1jPM7vB1KfRKXolSjmVJvJPTI6xgXzA0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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