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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c6d8777f03045643d1e5aa93544f5396caf27132b6625d08fed3d13fb26318' 
  AND token = 'US5BM6/u6aXnBo+tsl/PjurOe+jOcaGwKtKnEg53yfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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