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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94958ce085065dd865d36f0aaf21379b045ffe6c0c5a985a9b4a47b2d912a09' 
  AND token = 'XvviaqEGOIkFwor3WE4pQd1RecxCk63cJIYJY4pe01c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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