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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e03fae2547b413a8135dc9cd3e1375bcc86f6a8d3e091edb5ea6f759259ea6' 
  AND token = 'oVUU/zFuBXcnwF/JHM+5sfzMJBPsRgeoZmOaeASWgg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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