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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384d35177a6eab63851e39b8c390b59a45d59cbcc2b500a5c0b26bc76662b2bf' 
  AND token = '5g1AeVRCVlhBfRoBbYSB4DxKVf22TF+oKjoqThv0EWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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