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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe2db18e8e8856aa946fd7b4a47788378e05f3ae89f81301f838ea98848e5f1' 
  AND token = '42wYD+snrGe9lylVHYKEDOvWRTqw7+LDbgroDKZBRr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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