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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe1fc0f7681f2f4aae919a36bc0bcb8bd17c37a0ca161fdb6bdf89bccd323ce' 
  AND token = 'Uk35aZf5Yd95XgG3W7gkD/Oy8bphpQj07N9l+bHf9Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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