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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841af56c3f72088e9df8c1c642ab9914ce3f41c438baeeeab730807c74070fc6' 
  AND token = '5wJNC+VsynCSH+4AN9B3xxyCJtG5ROEswJsEPteMErQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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