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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd9280d1841fd6de37b4f8191544131f726235dd64be09ec9bed4bc930d1ce7' 
  AND token = 'hm8Pt3Pv2MElGD7Ibyw9AXUMJlSrXjSVbVOKjZa22Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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