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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6bea37a03aa654a8616e15730b0b656858bbc122bcc30d26ef218f84dae18bd' 
  AND token = 'z0ru/yiz+DWPbC+zoo/yY7Ab6t+yHCPvlkvOht8TcDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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