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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5283a135a6299508ff151710097895495edafa03e874d53a078b396dac2d84fd' 
  AND token = 'haJLiou87agMX/0cYi0ypFLwX30r6zPL2fkiYHaKX6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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