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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb9b13e16c4e0f603a53ee760f958380bb240abbf11b402253d1dd18b8a8ef0' 
  AND token = 'pz91gqiiRSsDee7vWe1byKnNAg0laHt1wNvMPA7gNYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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