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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc07d537a793abb294946bb4cd6b797c819d08d822797564cb99fa8748ff915' 
  AND token = '191ppGC7k6cl3HuSeQGryeQZBJVFRaz1QNClf2Fp62s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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