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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0620dc34fb9a949a2da82ae621f33db7b68534577cfd3cb5ca24f6f35ab4cf5a' 
  AND token = '10J1eqsDIeq9Ql7hZkXKWHQV7dznzHEyupc2o+NFf3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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