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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24366778e8cc782ae0d044e8b665114729bc4dfa43cffff3b3baaea0f759413a' 
  AND token = '/OIV04nm0TWlDCmSNbD8f9M1Ej2/LYNHpvBHuFuO2YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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