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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b7ae0cb6123bec9a93e44578c1375667712b86069ea65c26b78bdfb91e9fdc' 
  AND token = 'lubxhbxAzsCRZL1jlHwM5u8ld27aYRqju0NydFieeLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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