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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86995521aff65240d37775246474b5398062a9a5b37310068f557cf11a508aef' 
  AND token = '3g3eirIuV2/d4bwWdrgGndYlMbXO6t8aUD2UUc8CmLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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