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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3436151192ec0f7b81f2ea79f11f863fdb91e37ab5b903d63c33f2e5c9b9bb7' 
  AND token = '4q9zCdO2Ej558RLOtdfIoadgVsIIScurxsDa4ESfh6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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