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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cc53591fe666ed69b9a041a01efb34c51e87df1a45942de68accec058c276e' 
  AND token = 'TMmdfOa2MMz6f+SmXCYyIrMI7VPqN3SOmhuZxZqmlWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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