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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8120e12be06cbcdec0fbbd7e2829f2cdb56c72dbf305973872bc403f3df10a0' 
  AND token = 'UScUf1veQ6begHKMNAgDAF2VqL7OLw8XOwtAvsa2OdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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