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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08d440b850c5031b5d5c26de1f2d0cde2eeedb4ee19d0ffaafd643c4b7b1467' 
  AND token = 'LSD4DFKEasyp4kdAnGt0S8qUBV8xyCcOVXH4IsjS1D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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