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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c86afe5fe7203d3beca8253094d67cb414d786e24d9d11961571c2c728185f' 
  AND token = 'YNy6bzCgN7Ltq5v9L3FgBIOBe4N6+hftzXHV5Yda46M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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