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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20e02fad718ec349e51c53e4db14f56ef7cc1ee0e872e89e1d985050d3accaa' 
  AND token = 'LQ0XUPoXBuf5kv8wuaXJUJpOooqlxDlDKCCDtrB0oDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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