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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664fdbb135a62e9c2dce809889bee16336a9ef84509d3b7b054aaa25c71f5f6c' 
  AND token = 'xNzq8uSz5JwTFGBrTYzONkC3iBTscTh2h4AITK7jikA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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