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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e796dd8700bbb8e8c6c48f528ceaa559b9892e4c383344b95f2df00985fcd72' 
  AND token = '/k5Nqoa9P7xT65PsOdG38AtBTgcHupto9/PHaxOvWT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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