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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74965970ec069b82e7f23d07043e31cf6c8bb0689368b9455612f6f1c101d9c6' 
  AND token = '/ka+M9IxQkFXe+uD0hN3PAd79V3cPZ2HQ9It1l4cOzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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