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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160a7fff185eef5c54c55623ebb6781eca710c449477143b3346281277211ed0' 
  AND token = 'xo4oDBItzRBTt6zjot2p514KNQBmaT3Oz5M7eb/q4/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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