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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b23e057e51ab337b664f25895802060efea2db980818e31a60ba4e27579af0' 
  AND token = '3A7QDtT/LnW5A7tUcfDmR6xcWT6JwWFcHSuN/teD9FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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