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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b26c659347d1a3c1e64f8fc4be3f79be9d68e635f11c34c706d078e56032d3' 
  AND token = 'nqZOystj89dZqb8HUBQaTuaNZnbeOex2mTGY4mXjCVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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