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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76d31f8934c824352769cf26479395492cc7059817b294028f3d9e533fcc812' 
  AND token = '5edAj7xERxI5FN0bpKW2/nRqyQ93p2OcuRVEEdZa2tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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