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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac861bb41cdcab1c944b3421b0f7be9e8f44f64e2f58e67cef1eae56844cdba' 
  AND token = 'IVGuw40eJD0VhEQdOo/ALeLpVEDtUpa36/X2A6zHRXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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